linux-kernel - [PATCH] mptlan: add checks for dma mapping errors

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Message-Id: <1453503833-9945-1-git-send-email-khoroshilov@ispras.ru>
Date:	Sat, 23 Jan 2016 02:03:53 +0300
From:	Alexey Khoroshilov <khoroshilov@...ras.ru>
To:	Nagalakshmi Nandigama <nagalakshmi.nandigama@...gotech.com>,
	Praveen Krishnamoorthy <praveen.krishnamoorthy@...gotech.com>,
	Sreekanth Reddy <sreekanth.reddy@...gotech.com>,
	Abhijit Mahajan <abhijit.mahajan@...gotech.com>
Cc:	Alexey Khoroshilov <khoroshilov@...ras.ru>,
	MPT-FusionLinux.pdl@...gotech.com, linux-scsi@...r.kernel.org,
	linux-kernel@...r.kernel.org, ldv-project@...uxtesting.org
Subject: [PATCH] mptlan: add checks for dma mapping errors

mpt_lan_sdu_send() and mpt_lan_post_receive_buckets() do not check
if mapping dma memory succeed.
The patch adds the checks and failure handling.

Found by Linux Driver Verification project (linuxtesting.org).

Signed-off-by: Alexey Khoroshilov <khoroshilov@...ras.ru>
---
 drivers/message/fusion/mptlan.c | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/drivers/message/fusion/mptlan.c b/drivers/message/fusion/mptlan.c
index cbe96072a6cc..076bf45a95fe 100644
--- a/drivers/message/fusion/mptlan.c
+++ b/drivers/message/fusion/mptlan.c
@@ -734,6 +734,12 @@ mpt_lan_sdu_send (struct sk_buff *skb, struct net_device *dev)
 
         dma = pci_map_single(mpt_dev->pcidev, skb->data, skb->len,
 			     PCI_DMA_TODEVICE);
+	if (dma_mapping_error(mpt_dev->pcidev, dma)) {
+		netif_stop_queue(dev);
+
+		printk (KERN_ERR "%s: dma mapping failed\n", __func__);
+		return NETDEV_TX_BUSY;
+	}
 
 	priv->SendCtl[ctx].skb = skb;
 	priv->SendCtl[ctx].dma = dma;
@@ -1232,6 +1238,14 @@ mpt_lan_post_receive_buckets(struct mpt_lan_priv *priv)
 
 				dma = pci_map_single(mpt_dev->pcidev, skb->data,
 						     len, PCI_DMA_FROMDEVICE);
+				if (pci_dma_mapping_error(mpt_dev->pcidev, dma)) {
+					printk (KERN_WARNING
+						MYNAM "/%s: dma mapping failed\n",
+						__func__);
+					priv->mpt_rxfidx[++priv->mpt_rxfidx_tail] = ctx;
+					spin_unlock_irqrestore(&priv->rxfidx_lock, flags);
+					break;
+				}
 
 				priv->RcvCtl[ctx].skb = skb;
 				priv->RcvCtl[ctx].dma = dma;
-- 
1.9.1